gee...where does all that water come from?

Stating the obvious: Water flows downhill. As long as rain continues to fall above the waterfall then it will continue to flow because of the water cycle.No, there is no reason to suggest a waterfall will not continue to be a spectacular sight.

A triangular pyramid is a geometric solid with a base that is a triangle and all other faces are triangles with a common vertex.

A triangular prism is ageometric solid with two bases that are congruent (identical), parallel triangles and all other faces are parallelograms. It is referred to as a right triangular prism if the faces are rectangles.

marks...............

NOT VERY HAPPY MY MARKS, I UM GOTTA STRIVE BETTER MARKS IN SA2., ESPECIALLY MY ENG&CHINESE.JUST PRAY FOR SCIENCE..........ALSO I COULD VE GOT BETTER FOR MY MATH THOUGH CONTENTED.